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#ifndef FILTERH
#define FILTERH
#include "ratfn.h"
class filter{
private:
int numSections, numIsOdd, denSections, denIsOdd;
vector state, feedback, feedforward;
public:
filter( ratfn& );
double operator()(double u);
void reset();
friend ostream& operator<<(ostream&, const filter& );
};
struct state { cxVector v; int t; }; // THIS HAS TO BE OUTSIDE THE CLASS FOR 2.1?
class cxfilter{
private:
int order;
cxVector feedback, feedforward;
int t; // an index into the state vector
complex delay( int i ) { return delay_chain[(t+i-1)%order]; }
void shift_in( const complex );
cxVector delay_chain;
public:
cxfilter( ratfn& );
complex simulate(complex);
void reset();
struct state get_state(){
struct state s; s.v=delay_chain; s.t=t;
return s;
}
void set_state(const struct state &s){
t = s.t;
delay_chain = s.v;
}
};
#endif
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.